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Experts on Comets

comet is an icy small Solar System body that, when passing close to theSun, heats up and begins to outgas, displaying a visible atmosphere or coma, and sometimes also a tail. These phenomena are due to the effects of solar radiation and the solar wind upon the nucleus of the comet. Comet nuclei range from a few hundred metres to tens of kilometres across and are composed of loose collections of ice, dust, and small rocky particles. The coma and tail are much larger and, if sufficiently bright, may be seen from the Earth without the aid of a telescope. Comets have been observed and recorded since ancient times by many cultures.

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Name Missions & Mission Experience Targets Techniques Major Facilities & Instrument Development

Roger Clark
Cassini, Chandrayaan 1 (India), Europa Clipper, Galileo, Mars Global Surveyor, Mars Observer, MRO ** Instrument Co-Investigator, Mission Co-Investigator Asteroids, Ceres, Comets, Dwarf planets, Earth, Exoplanets, Icy satellites, Interplanetary Dust, Io, Jupiter, Kuiper Belt, Mars, Mercury, Moon, Neptune, Planetary rings, Pluto, Saturn, Small satellites, Titan, Uranus, Venus, Vesta Space-based observing, Spectroscopy, Remote sensing, Photometry, Numerical modeling, Geology, Ground-based observing, Mineralogy, Mapping

Robert Gaskell
Cassini, Dawn, MESSENGER, OSIRIS-REx, Rosetta, Voyager Asteroids, Comets, Earth, Icy satellites, Io, Mars, Mercury, Moon, Small satellites, Vesta Shape modeling

Amara Graps
Cassini, Dawn, Galileo, IRAS, New Horizons, Rosetta, Ulysses, Voyager ** Calibration/Test planning, Data archive, Data validation, Instrument operations, Mission science team, Requirements generation and flow down, Science operations Asteroids, Ceres, Comets, Dwarf planets, Enceladus, Icy satellites, Interplanetary Dust, Io, Io torus, Jupiter, Meteorites, Moon, Planetary rings, Saturn, Small satellites, Solar particles/Solar wind, Uranus, Vesta Astrobiology, Education/Public Outreach, Ground-based observing, Magnetospherics, Numerical modeling, Photometry, Remote sensing, Shape modeling, Space-based observing, Volcanism IRTF, Palomar ** Cameras, Dust counter

Tommy Grav
NEOWISE Asteroids, Comets, Icy satellites, Jupiter, Kuiper Belt, Neptune, Saturn, Small satellites, Uranus Ground-based observing, Numerical modeling, Photometry, Space-based observing

Bill Hartmann
Mariner 9 Asteroids, Comets, Earth, Mars, Meteorites, Moon, Small satellites Crater Counting, Education/Public Outreach, Ground-based observing, Volcanism

Henry Hsieh
Asteroids, Comets, Interplanetary Dust, Small satellites Space-based observing, Spectroscopy, Photometry, Numerical modeling, Education/Public Outreach, Ground-based observing, Astrobiology

Steve Kortenkamp
Asteroids, Comets, Interplanetary Dust, Meteorites, Small satellites Celestial Mechanics, Education/Public Outreach, Numerical modeling

Jian-Yang Li
Chang'E 2 (China), Dawn, Deep Impact, EPOXI, HST, OSIRIS-REx, Stardust-NExT ** Calibration/Test planning, Data archive, Data validation, Mission science team, Science operations Asteroids, Ceres, Comets, Dwarf planets, Interplanetary Dust, Small satellites, Vesta Ground-based observing, Mapping, Photometry, Remote sensing, Space-based observing, Thermal modeling ALMA, Gemini, Palomar

Eva Lilly
Asteroids, Comets, Kuiper Belt Astrometry, Education/Public Outreach, Photometry Gemini, Keck Observatory, Pan-STARRS

Jim McElwaine
Asteroids, Ceres, Comets, Earth, Icy satellites, Mars, Moon, Planetary rings, Pluto, Small satellites, Titan, Vesta Shape modeling, Radar, Numerical modeling, Geomorphology

Jeff Morgenthaler
GALEX, Sounding Rockets Comets, Earth, Europa, Gas giants, Io, Io torus, Jupiter, Solar particles/Solar wind Aeronomy, Astrometry, Atmospheres, Calorimetry, Ground-based observing, Photometry, Space-based observing, Spectroscopy, X-ray spectroscopy Kitt Peak ** Imaging spectrometers, Spectrometers, X-ray spectrometers

Beatrice Mueller
Asteroids, Comets, Trans-Neptunian objects Education/Public Outreach, Ground-based observing, Photometry Cerro Tololo

Robert Nelson
Cassini, Voyager Asteroids, Comets, Dwarf planets, Exoplanets, Icy satellites, Io, Mercury, Moon, Small satellites, Titan Spectroscopy, Remote sensing, Photometry

David O'Brien
Dawn Asteroids, Ceres, Comets, Dwarf planets, Exoplanets, Icy satellites, Small satellites, Vesta Astrobiology, Numerical modeling, Remote sensing

Thomas Prettyman
Dawn, Lunar Prospector, Mars Odyssey ** Calibration/Test planning, Data archive, Data validation, Electronics design, Flight Software, Instrument operations, Instrument PI, Mission Co-Investigator, Mission science team, Requirements generation and flow down Asteroids, Ceres, Comets, Dwarf planets, Earth, Mars, Mercury, Meteorites, Moon, Small satellites, Venus, Vesta Education/Public Outreach, Geology, Mapping, Neutron detectors, Numerical modeling, Remote sensing, Shape modeling, Space-based observing

James Richardson Jr.
Deep Impact, EPOXI ** Mission science team Asteroids, Comets, Icy satellites, Moon Geomorphology, Impacts, Numerical modeling, Radar Arecibo

Nalin Samarasinha
Asteroids, Comets, Kuiper Belt Education/Public Outreach, Ground-based observing, Numerical modeling, Remote sensing Cerro Tololo, Kitt Peak

Jordan Steckloff
EPOXI, Stardust-NExT Asteroids, Charon, Comets, Dwarf planets, Icy satellites, Kuiper Belt, Pluto, Small satellites, Titan, Trans-Neptunian objects Celestial Mechanics, Education/Public Outreach, Numerical modeling, Thermal modeling

Mark Sykes
Dawn, IRAS, Spitzer ** Data archive, Mission Co-Investigator, Mission science team Asteroids, Ceres, Charon, Comets, Dwarf planets, Interplanetary Dust, Pluto, Small satellites, Vesta Ground-based observing, Photometry, Radiometry, Remote sensing, Space-based observing IRTF

Pasquale Tricarico
Dawn ** Spacecraft navigation Asteroids, Ceres, Comets, Vesta Numerical modeling

Stu Weidenschilling
Asteroids, Comets, Exoplanets, Meteorites, Small satellites, Trans-Neptunian objects Numerical modeling

John Weirich
OSIRIS-REx Asteroids, Comets, Earth, Moon, Small satellites Shape modeling, Geology, Mineralogy

Paul Weissman
Galileo, Rosetta Asteroids, Comets, Kuiper Belt, Small satellites Space-based observing, Remote sensing, Photometry, Numerical modeling, Education/Public Outreach, Ground-based observing

Xiao-Duan Zou
Chang'E 1 (China), Chang'E 2 (China), Chang'E 3 (China) Asteroids, Comets, Moon Shape modeling, Remote sensing, Photometry, Geology, Mapping

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